20080868 Ver 2_I-19 2014 Huddles Sweep Upstream Biotic Index Table_20150717

Table 1 -19. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Huddles Cut upstream station in
May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxon'
individuals"
value (SV)'
value (n)
(SV)(n)
Annelida
Oligochaeta
Peloscolex heterochaetus
25
1.1
10
11.0
Tubificidae sp. w/o hair
3
1.0
3
3.0
Polychaeta
Amphicteis floridus
16
2.0
10
20.0
Heteromastus filiformis
4
1.1
3
3.3
Polydora cornuta
3
1.2
3
3.6
Streblospio benedicti
9
1.1
3
3.3
Arthropoda
Insecta
Diptera
Chironomus decorus
49
1.0
30
30.0
Goeldichironomus devineyae
31
2.0
30
60.0
Tanytarsus sp.
4
2.3
3
6.9
Malacostraca
Amphipoda
Apocorophium louisianum
6
2.2
3
6.6
Apocorophium sp.
21
2.2
10
22.0
Gammarus tigrinus
28
2.2
10
22.0
Decapoda
Palaemonetes pugio
191
2.5
100
250.0
Isopoda
Cassidinidea lunifrons
5
2.0
3
6.0
Mollusca
Bivalvia
Macoma balthica
3
1.5
3
4.5
Macoma tenta
2
2.0
1
2.0
Gastropoda
Littoridinops tenuipes
28
2.0
10
20.0
Total
235
474.2
Estuarine Biotic Index = 2.01
Total taxa = 18
Total taxa with sensitivity values = 17
'Only those taxa for which a sensitivity value is available
are displayed.
bTotal number of individuals caught in all three sweep replicates.
`Sensitivity values provided by NCDWR.
1 -23